Make a draft of your presentation.
This should be written in Word and should be at least 1 - 1,5 pages long.
Do it as follows:
Sub-topic 1
Write down the information you found.
Sub-topic 2
Write down the information you found.
Sub-topic 3
Write down the information you found.
Sub-topic 4
Write down the information you found.
Introduction
What is your topic about? Why did you choose this topic? What will you tell?
Conclusion
Write down in 2 or 3 sentences what you found out about your topic what you didn't know yet.